import java.net.Socket;
import java.net.ServerSocket;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.IOException;

// An example of a very simple socket server.  Start by looking at the
// static main() method at the bottom of this file.
public class RVLServer {
    private int serverPort = 0;
    private ServerSocket serverSock = null;
    writeToFileClass wf = new writeToFileClass();
    
    public RVLServer(int serverPort) {
        this.serverPort = serverPort;

        try {
            serverSock = new ServerSocket(serverPort);
        }
        catch (IOException e){
            e.printStackTrace(System.err);
        }
    }
    
    // All this method does is wait for some bytes from the
    // connection, read them, then write them back again, until the
    // socket is closed from the other side.
    public void handleConnection(InputStream sockInput, OutputStream sockOutput) {
        while(true) {
            byte[] buf=new byte[1024];
            int bytes_read = 0;
            try {
                // This call to read() will wait forever, until the
                // program on the other side either sends some data,
                // or closes the socket.
                bytes_read = sockInput.read(buf, 0, buf.length);

                // If the socket is closed, sockInput.read() will return -1.
                if(bytes_read < 0) {
                    System.err.println("Tried to read from socket, read() returned < 0,  Closing socket.");
                    return;
                }
                /*System.err.println("Received "+bytes_read
                                   +" bytes, sending them back to client, data="
                                   +(new String(buf, 0, bytes_read)));*/
                String strTxt = new String(buf, 0, bytes_read);
                
                if( (strTxt.indexOf("|PPD") > -1) || (strTxt.indexOf("|VSD") > -1) || (strTxt.indexOf("|ISC") > -1))
                {                  
                  wf.readData(strTxt);
                }
                else
                {
                  System.out.println("Other data "+strTxt+"\n");
                }
                
                sockOutput.write(buf, 0, bytes_read);
                // This call to flush() is optional - we're saying go
                // ahead and send the data now instead of buffering
                // it.
                sockOutput.flush();
            }
            catch (Exception e){
                System.err.println("Exception reading from/writing to socket, e="+e);
                e.printStackTrace(System.err);
                return;
            }
        }

    }

    public void waitForConnections() {
        Socket sock = null;
        InputStream sockInput = null;
        OutputStream sockOutput = null;
        while (true) {
            try {
                // This method call, accept(), blocks and waits
                // (forever if necessary) until some other program
                // opens a socket connection to our server.  When some
                // other program opens a connection to our server,
                // accept() creates a new socket to represent that
                // connection and returns.
                sock = serverSock.accept();
                System.err.println("Have accepted new socket.");

                // From this point on, no new socket connections can
                // be made to our server until we call accept() again.

                sockInput = sock.getInputStream();
                sockOutput = sock.getOutputStream();
            }
            catch (IOException e){
                e.printStackTrace(System.err);
            }

            // Do something with the socket - read bytes from the
            // socket and write them back to the socket until the
            // other side closes the connection.
            handleConnection(sockInput, sockOutput);

            // Now we close the socket.
            try {
                System.err.println("Closing socket.");
                sock.close();
            }
            catch (Exception e){
                System.err.println("Exception while closing socket.");
                e.printStackTrace(System.err);
            }

            System.err.println("Finished with socket, waiting for next connection.");
        }
    }

    public static void main(String argv[]) {
        int port = 1818;
        while (true) {
          RVLServer server = new RVLServer(port);
          server.waitForConnections();
        }
        
    }
}

